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Specification ostore
enrich
   ostorea, 
   oset
with
   

   
   
   functions  . .min : store → elem;
              . .butmin : store → store;
              . .keys : store → set;
   
   
   
   
   

   

   axioms Min-in :  ⊦ st ≠ ∅ → st.min ∈ st;
          used for: lf, kodkodaxstrong;
          Min-min :  ⊦ a ∈ st → ¬ a < st.min;
          used for: lf, kodkodaxstrong;
          Butmin :  ⊦ st.butmin = st -- st.min;
          used for: ls;
          Keys :  ⊦ a ∈ st.keys ↔ a ∈ st;
          used for: ls, nokodkodax;

   

   
end enrich